1
by Keim, Rudolf
Published 1972
Springer Berlin Heidelberg
...Ag. Silber. Silver (System-Nr. 61)...

2
by Buschbeck, Karl-Christian
Published 1971
Springer Berlin Heidelberg
...Ag. Silber. Silver (System-Nr. 61)...

3
by Seuferling, Franz
Published 1970
Springer Berlin Heidelberg
...Ag. Silber. Silver (System-Nr. 61)...